ps：扫描只有一条轨迹，该轨迹可以是单个直线段也可以是chain（直线链）、curve chain （曲线链），扫描截面与轨迹始终垂直，截面必须封闭且必须绘制在基准面或实体曲面加一个参考上
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Select Start Curve of Chain 选择曲线串的开始曲线 ; 选择曲线串的起头曲线
Select End Curve of Chain 选择曲线串的结束 ; 选择曲线串的竣事
value chain curve 价值链曲线
Plastic curve-going chain 塑料弯道链板
chain curve 链曲线
cost curve of value chain 价值链成本曲线
Value chain effects - Experience curve effects are not limited to the company.
不仅公司有经验曲线效应。
Suppliers and distributors will also ride down the learning curve, making the whole value chain more efficient.
供应商和分销商也有，从而使整个价值链都更加有效。
The Caribbean islands finding themselves along the eastern curve of the Caribbean Plate will thus experience increased volcanic activity in the many volcanoes that lie on that island chain.
加勒比群岛会发现自己处在加勒比板块的东部曲线上因此坐落在岛链上的很多火山都会经历越来越多的火山活动。
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